If a patient has mitral valve insufficiency and severe prolapse leading to blood regurgitation from the heart to the lungs, the patient must have very obvious symptoms. The most common symptoms are as follows: 1) the patient will have chest tightness and shortness of breath after activity, which is manifested by a significant decrease in physical strength, and a slight walk faster or climbing stairs more than two floors will feel that there is not enough air, so they have to stop and rest; 2) some patients will feel tightness in the chest after lying flat when they sleep at night, just like a stone pressing on the chest, and they have to sit up to get better, which are relatively mild manifestations; 3) some patients have a sudden onset of regurgitant bleeding, and the amount of regurgitant bleeding is particularly large. Some patients have sudden onset, and the amount of regurgitated blood is particularly large, and even serious heart failure and pulmonary edema appear, and they have to be resuscitated in the hospital. Depending on the severity of the lesion, the performance is different. The most common is chest tightness and shortness of breath after activity, feeling that the physical strength has decreased and cannot move, and the patient is advised to come to the hospital for examination. A small number of patients will tell the doctor that when they sleep at night and put their hands on their chest they feel an electric vibration and whirring sound, combined with the appearance of chest tightness and shortness of breath, the doctor probably estimates that there is a problem with the heart valves and that the leakage of blood has caused a washout of the valves causing murmurs and tremors, which the doctor will verify with a stethoscope.